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Midterm

Energy (USE) - Midterm 2.docx

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Department
Astronomy
Course Code
CAS AS 101
Professor
Paul Withers

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AS 101: ENERGY LECTURE 9- 30-13 1 ENERGY: Kinetic Energy= Energy associated with motion. Radiative Energy= Energy carried by light. Potential Energy= Stored energy (more usefully, everything else) Moving  ▯Kinetic (driving) Not Moving  ▯Potential (battery) Radiative  ▯Cell Phone Energy Vocal chords  ▯Kinetic Energy *Earth moves as it orbits the sun. What affects Earth’s kinetic energy? ­Earth’s mass and speed ­Kinetic energy = ½ m x v ­m= mass (kg), v=speed (m/s) Kinetic Energy (KE): • Macroscopic objects  Planet orbiting the sun  Car driving on road  Ball bouncing 2  KE= 0.5 m x v • Microscopic objects  Atoms & Molecules  Thermal energy of an object is the total kinetic energy of all the  atoms and molecules it contains. Thermal Energy & Temperature: • Related, but not same thing • Thermal energy is total KE of atoms • Temperature measures the average KE of atoms • Example: 400 F oven and 215 F pot of water  • Atoms in hot objects move faster than atoms in cold objects • Atoms in the air typically move at the speed of sound. (300 m/s) Potential Energy: • Gravitational potential energy   Rock on edge of the cliff • Chemical potential energy  Battery AS 101: ENERGY LECTURE 9- 30-13 2 • Electrical Potential energy • Mass potential energy Gravitational Energ
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